The power point slides for this presentation are available via the attached Fluid presentation
Summer 2007 JA_SIG Conference
DLM the uPortal Pushmi-pullyu: Presented by Jim Helwig and Susan Bramhall. Good conceptual overview of DLM
Mark Boyd's DLM pre-conference seminar 
No notes but excellent presentation of 2.6 Distributed Layout Manager as released in 2.6 plus features in Luminis IV not yet in uPortal
Classic but very worthwhile
Justin Tilton's December 2001 uPortal 2.0 Look & Feel presentation
This is a great presentation of base uPortal presentation / layout management using Simple Layout Manager. This architecture is the brain child of Peter Kharchenko. 
uPortal Architecture Overview
Still an accurate write up.